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Metra 70-1858L Receiver Wiring Harness

Connect a new car stereo in select 1988-94 Buick and Pontiac vehicles

12 Reviews

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This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

Metra 70-1858L Wiring Harness

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

First, attach the color-coded wires on your Crutchfield-supplied harness to the wires from your new stereo. If you're not using a soldering iron, we recommend that you purchase some wire connectors to secure the connections. Check out our handy article on three ways to connect the wiring harness here.

Now, once this harness is connected to your new stereo, you'll be able to plug right into your car's factory radio connector. This harness saves installation time since you won't have to cut factory wires individually, and this also enables you to re-install the factory radio if needed. A detailed instruction sheet comes with the harness. Warranty: 60 days.

Please read this important note: This harness may not contain provisions for every wire needed to complete your installation, and it will not accommodate special navigation, video, or factory steering wheel control connections. You will need a special adapter if you want your factory steering wheel audio controls to work with your new stereo.


  • 12V constant power
  • 12V switched power
  • chassis ground
  • power antenna turn-on
  • dimmer
  • left front speaker +/-
  • right front speaker +/-
  • left rear speaker +/-
  • right rear speaker +/-

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so. You can also call an Advisor for more information.

Fits perfectly in my 1993 Buick Regal Custom!

Matthew, Waxhaw, NC

What's in the Box:


Metra 70-1858L Receiver Wiring Harness Reviews

Average Customer Review(s):

(12 Reviews)

Metra 70-1858L Receiver Wiring Harness

Matthew from Waxhaw, NC on 6/2/2018

1993 Buick Regal
Crutchfield Customer Review (What's this?)

Fits perfectly in my 1993 Buick Regal Custom!

Pros: Fits perfectly

Cons: none

93 Buick

Gene from bangor, ME on 1/22/2016

1993 Buick Regal
Crutchfield Customer Review (What's this?)

Product fit perfectly once I found out that it does not plug into the wiring that came out of the radio but needs to be plugged into the remote module behind the glove box.

Pros: Fit perfect

Cons: Did not know that it had to be plugged into a remote location

Metra 70-1858L Receiver Wiring Harness

bsr from Texas on 1/13/2016

Crutchfield Customer Review (What's this?) loss of clarity easy to use

Pros: simple to use

Cons: none


Ryan from Ohio on 9/13/2015

1992 Buick Regal
Crutchfield Customer Review (What's this?)

For everyone saying that this didn't fit, they're looking in the wrong place. I pulled my factory dash unit out of my 92 Buick Regal Sedan to find two small plugs that wouldn't fit the harness. Said a couple things and called Crutchfield's tech support, they told me that the plugs I needed were up under the dash on the passenger side. 2 minutes later I found it and was relieved. If Crutchfield says it will fit, it will, trust me. They know what they are doing.

Pros: Like how the wires that are unused are capped off, helps prevent mistakes.


Metra 70-1858L Receiver Wiring Harness

Crutchfield customer from South Carolina on 8/1/2015

1994 Buick Regal
Crutchfield Customer Review (What's this?)

Hard to find product in stores around my area. Good product. Easy to install. Comes with instructions as well. Good price!



Wire harness

Perry from Minot, ND on 8/26/2014

1992 Buick Regal
Crutchfield Customer Review (What's this?)

Works and fits perfectly

Pros: Makes hook up a breeze.


Perfect fit

Todd from Texas on 1/29/2014

Crutchfield Customer Review (What's this?)

Fit effect, great length.



Does Not Fit

Bend3r117 from Huntsville,Al on 1/3/2013

I have a 92 Buick Regal, This harness does nothing for me. The plugs on my car cannot in no way fir this harness. Ever. The picture on the web site of the 92 regal inter. is not even right. Dont know whats going on here???? Suppose to Fit they say, Whatever!!

Pros: Came to me fast.

Cons: will not fit car, despite the info provided

Not good for buick 1988 installation

Snook from Columbus, Ohio on 10/10/2012

1988 Buick Regal
Crutchfield Customer Review (What's this?)

bought this product about a week ago.waited for it to come in the mail. finally came in. unistalled my factory radio and cassette player...the harness was long enough but the plugs that are spose to slide into this harness were bigger than the end of harness which was very upsetting.

Pros: got to my house on the right day.

Cons: couldnt have been the right size for a buick regal 1988 because the plugs that go into the hardness were bigger.

Buy it!

Ron from Morton, PA on 2/17/2012

1991 Buick Regal
Crutchfield Customer Review (What's this?)

This harness makes the installation of an aftermarket radio a breeze! Save yourself a LOT of aggrevation and get it!

Pros: Each wire is labeled, plugs right in to existing harness.

Cons: none.

Old car - new radio

charlie1593 from Mt. Olive Twsp. NJ on 9/7/2010

Crutchfield Customer Review (What's this?)

The harness made installing a new radio a snap. I installed a Pioneer CD receiver into a '91 Buick Regal which came with a factory 3 piece sound system. The wiring set up from Crutchfield, AND the advice they gave me, made the job a snap. Thanks Crutchfield, you've done it again.



Not good for a Corvette installation

Mark from Mary Esther, FL on 2/9/2009

1995 Chevrolet Corvette
Crutchfield Customer Review (What's this?)

This factory adaptor is not compatible with how GM wired the radio in the 95 Corvette. Basically, I do not have a BOSE system but the radio still wires to a amp/box in the rear storage compartment, similar to the BOSE system. This supplied harness does not resemble the 7 & 9 pin connectors attached to the factory. Of course there is another harness available to order after I totally tore apart my dash to install the radio! I should get it in a week or so and I'll try again!




Hands-on research

Product Research


Wiring Harness: The wiring harness prevents you from having to cut your vehicle's factory radio plug when replacing your factory radio with an aftermarket head unit. Simply solder or crimp the wiring harness to your aftermarket head unit's harness (solder & crimps not included), plug the aftermarket head unit's plug into the rear chassis of the aftermarket head unit, and plug the wiring harness into your vehicle's factory radio plug.

Note: Installation tools, hardware, & accessories are not included & sold separately. Please see the Accessories tab for recommendations & availability.

Wiring Notes: If the wiring harness is not equipped with a ground wire, you will need to ground the aftermarket head unit's ground wire to the metal chassis of your vehicle. Some vehicle's may require you to bypass the vehicle's factory amplifier (in another location from factory radio) or hardwire certain connections. If your vehicle is equipped with factory steering wheel controls, an additional adapter is required & sold separately.

Wire Code Chart:

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Ground
Blue Power Antenna/Amp Turn-On
Orange/White Illumination
White Left Front Speaker +
White/Black Left Front Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

simplifies installation in a smaller car [ DOUGLAS  Sep 02, 2018 ]
putting in a new radio for my car [ Phillip  May 24, 2016 ]
Ease of installation [ Douglas  Dec 10, 2015 ]

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